Highly efficient, phase-matched high-harmonic generation by a self-guided laser beam

被引:181
作者
Tamaki, Y
Itatani, J
Nagata, Y
Obara, M
Midorikawa, K
机构
[1] RIKEN, Inst Phys & Chem Res, Laser Technol Lab, Wako, Saitama 3510198, Japan
[2] Keio Univ, Dept Elect & Elect Engn, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
关键词
D O I
10.1103/PhysRevLett.82.1422
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We demonstrate a phase-matched high-harmonic generation of 100 fs Ti:sapphire laser pulses by a self-guided beam in 30 Torr of neon gas. Phase matching of high harmonics is experimentally examined by changing the propagation length up to 7 mm. Phase-matched propagation over 7 mm magnifies the conversion efficiency around the 49th harmonic (in the cutoff region) by 40 times. On the other hand, harmonics around the 25th order (in the plateau region) peak at 4 mm, resulting in an enhancement of 4. This scheme enhances the conversion efficiencies in the cutoff region up to 10(-6), corresponding to a few nJ per high-harmonic pulse in the 76 eV region. [S0031-9007(99)08446-X].
引用
收藏
页码:1422 / 1425
页数:4
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